Re: CListCtrl, hide and edit

From:

"Bill Brehm" <don't want spam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 11 May 2008 00:43:56 +0800

Message-ID:

<eRlaM0rsIHA.3804@TK2MSFTNGP02.phx.gbl>

I'm working on the Owner Data part now. I notice that when I double click
the right of any column header, it no longers sizes the column to the
longest item within that column any where in the data, but only to the
longest item in the column that is currently visible. Is that normal for
Owner Data? Or did I bugger up something else? If normal, is there any way
to get the original functionality back?

I also notice that since I use qsort() to replace the built-in column sort
functionality, there is something funny going on. I looked into sorting and
it seems some implementations of qsort (this one included) are not "stable"
in that they do not preserve the order items that have identical sort keys.
Does MSVC++ 6 have a stable sort function or must I write my own?

Thanks...

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:ajr824dack336k0v1fbvbkl046l6pnlbv9@4ax.com...

Use custom-draw and you can display anything you want. I've displayed a
check box,
although I was too lazy to write the code to detect the OnLButtonDown in
the check box to
allow it to be changed, but that was because it was a personal project.

I've done expanding controls like list controls in CListBox, and I did it
by using a
variable-height box (the limit is 255 pixels, and the nature of the data
was that there
were between 1 and 5 subitems if the user wanted to see them, so we were
within the 255
pixel limit). I do not know if there is a similar height restriction on
CListCtrl items.

However, it sounds more like you want a custom grid control than a custom
CListCtrl.
joe

On Fri, 9 May 2008 08:34:44 +0800, "Bill Brehm" <don't want spam> wrote:

I was wondering if there is a way to display something other than text in
a
subitem. Two things come to mind.

1. Could I put a checkbox in as one of the items? I would like to use it
to
display a boolean value and also to allow that value to be editted.
2. Could I use one column to display the tree control type of + and - (and
maybe lines) that I could click and expand groups of items. What i'm
looking
for is something like Excel's grouping capability, rather than a tree
control next to a list control, as in File Explorer. If not, what do you
think about putting a tree control next to or on top of a column of a list
control?

Thanks,

Bill

"Tom Serface" <tom.nospam@camaswood.com> wrote in message
news:EE4BFD17-0635-434D-BDE3-6AF0603E1E05@microsoft.com...

I typically sort the items in my memory list (the one the list control is
calling on to get it's value line by line). Of course the memory list
can
be just about anything, but for me it's typically a vector of CObList of
objects so sorting is usually based off of one of the items in the
object.
For example, I typically have a list of items that I just call a routine
on
like:

bool CDialogWithList::CompareAndSwapString1(int pos, bool bAscending)
{
    CMyObjectInfo *temp;
    int posFirst = pos;
    int posNext = pos + 1;

    if(!bAscending) {
         if (((CMyObjectInfo *)GetAt(posFirst))->m_csString1 <
              ((CMyObjectInfo *)GetAt(posNext))->m_csString1) {
              temp = (CMyObjectInfo *)GetAt(posFirst);
              SetAt(posFirst, GetAt(posNext));
              SetAt(posNext, temp);
              return TRUE;
        }
   }
   else if (((CMyObjectInfo *)GetAt(posFirst))->m_csString1 >
         ((CMyObjectInfo *)GetAt(posNext))->m_csString1) {
         temp = (CMyObjectInfo *)GetAt(posFirst);
         SetAt(posFirst, GetAt(posNext));
         SetAt(posNext, temp);
         return TRUE;
    }
    return FALSE;
}

bool CDataFileArray::CompareAndSwapDate(int pos, bool bAscending)
{
   CMyObjectInfo *temp;
   int posFirst = pos;
   int posNext = pos + 1;
   if(!bAscending) {
       if (((CMyObjectInfo *)GetAt(posFirst))->m_cDate <
           ((CMyObjectInfo *)GetAt(posNext))->m_cDate) {
           temp = (CMyObjectInfo *)GetAt(posFirst);
           SetAt(posFirst, GetAt(posNext));
           SetAt(posNext, temp);
           return TRUE;
       }
   }
   else if (((CMyObjectInfo *)GetAt(posFirst))->m_cDate >
       ((CMyObjectInfo *)GetAt(posNext))->m_cDate) {
           temp = (CMyObjectInfo *)GetAt(posFirst);
           SetAt(posFirst, GetAt(posNext));
           SetAt(posNext, temp);
           return TRUE;
   }
   return FALSE;
}

Then I call a routine to Sort the object list like:

void CMyDialogWithList::Sort(MY_DATA_SORT_ITEMS nSort, bool bAscending)
{
    bool bNotDone = TRUE;
    int pos = 0;

    while (bNotDone) {
         bNotDone = FALSE;
         switch(nSort) {
         case MY_DATA_SORT_NONE:
              break;
         case MY_DATA_SORT_STRING1:
              for(pos = 0;pos < GetUpperBound();pos++)
                   bNotDone |= CompareAndSwapString1(pos, bAscending);
              break;
         case MY_DATA_SORT_STRING2:
              for(pos = 0;pos < GetUpperBound();pos++)
                   bNotDone |= CompareAndSwapString2(pos, bAscending);
              break;
         case MY_DATA_SORT_DATE:
             for(pos = 0;pos < GetUpperBound();pos++)
                   bNotDone |= CompareAndSwapDate(pos, bAscending);
             break;
         default:
              break;
         };
    }
}

So I don't use the sort mechanism in the list control at all. When the
column wants to sort I just sort the list then refresh the current
screen
and only the items on the screen are drawn. I also move it back to the
top of the list when someone sorts one of the columns. I think is sort
of
expected behavior. This is may not be the most efficient method for
doing
sorting, but it works well and keeps the object list in an order that I
can write out and read back in the same order as the user last sorted.

Also, you can edit sub-items, but you have create your own edit control
or
trick it into think it is colums 0. For example:

http://www.codeguru.com/cpp/controls/listview/editingitemsandsubitem/article.php/c4175/

It's not that difficult once you get it implemented.

Tom

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:cllu14ti1a6i5oebn448d47l9rpbga6gfs@4ax.com...

See below..

program displays the first item in each location. I can use the iItem
number
instead to solve that and it looks correct. Sorting gives an ASSERT now
but
that depends on lParam too so it's not surprising. However, how do I
solve
that because I can't get at the iItem number in the compare function.

****
Tom Serface is our virtual-CListCtrl guru, perhaps he can answer this.
I've not used
virtual controls because I typically have a small number of items to
store, and there are
only a few cases where I *should* have used one, but because it was not
a
"product
deliverable" but a personal hobby project, I didn't bother.
****

Also, how do I deal with the number of items in the list control? I
could
imagine I just set the size of the list to the total number of items I
should be displaying. It should be fast to do that - the control just
allocates or deallocates memory. Is that correct?

****
For a virtual control, there is no allocation at all, which is why you
get the
performance.
***

Lastly, is it possible to edit a list control subitem in place? If not,
what
is the purpose of EditLabel()? Oh wait. I set Edit Labels. Now I can
get
an
in place edit of the first column. How can I do the other columns?

****
Due to fundamental failures of design, a CListCtrl only allows the
editing of the 0th
elment, making it nearly useless for anything that has sophisiticated
constraints (for
example, I'd like the 0th element to be the index, but now I have to
get
into manipulating
the column order to make the one-and-only-editable-field be the logical
column 0 while
displaying some other column in the leftmost position, a real pain). I
think there are
some articles in www.codeproject.com on creating a CListCtrl subclass
in
which any column
can be edited, and I would consider looking there first.
joe
****

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm